package com.itheima.reggie.service.impl;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {


    @Autowired
    private SetmealDishService setmealDishService;


    /**
     * 新增套餐,同时需要保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map(item -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);

    }

    /**
     * 套餐删除,同时需要查询套餐状态，确定是否可用删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteWithDish(List<Long> ids) {
        //select count(*) from setmeal where id in (1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除
        LambdaQueryWrapper<Setmeal> lqw = new LambdaQueryWrapper<>();
        lqw.in(Setmeal::getId, ids);
        lqw.eq(Setmeal::getStatus, 1);

        int count = this.count(lqw);


        if (count > 0) {
            //如果有在售状态,报出异常,提示操作者
            throw new CustomException("套餐正在售卖中，不能删除");
        }
        //如果都是停售,先删除从表
        //delete from setmeal_dish where setmeal_id in (1,2,3)
        LambdaQueryWrapper<SetmealDish> setmealDishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealDishLambdaQueryWrapper.in(SetmealDish::getSetmealId, ids);
        //删除关系表中的数据----setmeal_dish
        setmealDishService.remove(setmealDishLambdaQueryWrapper);

        //如果可以删除，先删除套餐表中的数据---setmeal
        this.removeByIds(ids);
    }

    /**
     * 数据回显
     * @param id
     */
    @Override
    public SetmealDto ByIdWithDish(Long id) {
        //1.获取该ID下的套餐属性信息
        Setmeal setmeal = this.getById(id);
        //2.创建dto对象,
        SetmealDto setmealDto = new SetmealDto();
        //3.拷贝套餐属性到dto的继承属性上
        BeanUtils.copyProperties(setmeal,setmealDto);


        //创建条件构造器
        LambdaQueryWrapper<SetmealDish> lqw = new LambdaQueryWrapper<>();
        lqw.eq(SetmealDish::getSetmealId, id);
        //获得该套餐下的菜品数据
        List<SetmealDish> list = setmealDishService.list(lqw);

        //把菜品数据封装到dto中setmealDishes属性上
        setmealDto.setSetmealDishes(list);

        return setmealDto;
    }
}
